Caustic soda, also known as sodium hydroxide (NaOH), is one of the most widely used industrial chemicals in the world. Its strong alkalinity, reactivity with acids, and high solubility make it essential in numerous manufacturing processes. Below are the most important and common uses of caustic soda across industries:

1. Soap and Detergent Production

Caustic soda plays a vital role in the saponification process, where it reacts with fats and oils to produce soap. It is also used in making household and industrial detergents, providing the alkaline base required to break down grease and organic matter.

2. Textile Industry

In the textile sector, sodium hydroxide is used for mercerizing cotton, which enhances strength, dye absorption, and sheen. It also helps in bleaching, scouring, and removing natural oils and waxes from fibers.

3. Pulp and Paper Industry

Caustic soda is essential in the Kraft process for pulping wood. It breaks down lignin and separates cellulose fibers, allowing for smoother paper production. It’s also used in paper bleaching and wastewater treatment.

4. Water and Wastewater Treatment

NaOH is widely used to neutralize acidic water, raise pH levels, and precipitate heavy metals in industrial wastewater. It is a reliable chemical for both municipal and industrial water treatment facilities.

5. Aluminum Production

In the Bayer process, caustic soda is used to extract alumina (Al₂O₃) from bauxite ore. This alumina is then used to manufacture aluminum metal, making NaOH a key raw material in the metal industry.

6. Food Industry (Regulated Use)

In food processing, caustic soda is used for peeling fruits and vegetables, removing skins from tomatoes or potatoes, and even curing olives or pretzels. It is strictly regulated for food-grade use.

7. Chemical Manufacturing

Caustic soda is a building block in the production of many chemicals including:

• Sodium hypochlorite (bleach)
• Sodium phenolate (used in pharmaceuticals)
• Dyes and pigments
• Synthetic fabrics and resins

8. Petroleum and Natural Gas Refining

Caustic soda helps in removing sulfur compounds and acidic contaminants from crude oil and natural gas, improving fuel stability and quality.

9. Cleaning and Disinfection

Used as a strong industrial cleaner, NaOH can dissolve grease, proteins, and organic build-up. It’s common in breweries, dairy production, and heavy-duty cleaning systems.

Trusted Global Supplier – Iran Caustic Soda

Iran Caustic Soda supplies high-purity caustic soda flakes to industrial clients worldwide. As a subsidiary of Shetab Gostar Nadin Trading Co., we ensure consistent quality, competitive pricing, and full export support with COA, SDS, and safe packaging options.